Re: ✗ Xe.CI.BAT: failure for drm/xe/wa: Steer RMW of MCR registers while building default LRC

[Matt Roper <matthew.d.roper@intel.com>]

On Sat, Feb 07, 2026 at 11:05:06PM +0100, Michal Wajdeczko wrote:
> 
> 
> On 2/7/2026 12:57 AM, Matt Roper wrote:
> > On Fri, Feb 06, 2026 at 11:15:16PM +0000, Patchwork wrote:
> >> == Series Details ==
> >>
> >> Series: drm/xe/wa: Steer RMW of MCR registers while building default LRC
> >> URL   : https://patchwork.freedesktop.org/series/161300/
> >> State : failure
> >>
> >> == Summary ==
> >>
> >> CI Bug Log - changes from xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5_BAT -> xe-pw-161300v1_BAT
> >> ====================================================
> >>
> >> Summary
> >> -------
> >>
> >>   **FAILURE**
> > 
> > Hmm, it looks like this is problematic in SRIOV VF environments because
> > the VF doesn't know how to steer (because it doesn't have access to the
> > fuse registers that provide the necessary details).  Lack of steering
> > knowledge usually isn't a problem since the VF also doesn't need to do
> > any CPU-originated MCR accesses (steered via 0xFD4).  But in this case
> > to do a CS-originated RMW operation on an MCR register, the ability to
> > steer properly does become important, and the VF just doesn't have a way
> > to get the information it needs.
> > 
> > I'm not sure how to fix that gap.  Michal, any thoughts?
> 
> It looks that VFs already know the fuses at the time of mcr_init() just
> we didn't let them run any initialization since we didn't need that.
> 
> We can let them do that now and with [1] I didn't see any WARNs.
> 
> Michal
> 
> [1] https://patchwork.freedesktop.org/series/161319/

Makes sense.  I just reviewed+applied your series, and started a re-test
on this patch to get a new set of CI results.


Matt

> 
> > 
> > 
> > Matt
> > 
> >>
> >>   Serious unknown changes coming with xe-pw-161300v1_BAT absolutely need to be
> >>   verified manually.
> >>   
> >>   If you think the reported changes have nothing to do with the changes
> >>   introduced in xe-pw-161300v1_BAT, please notify your bug team (I915-ci-infra@lists.freedesktop.org) to allow them
> >>   to document this new failure mode, which will reduce false positives in CI.
> >>
> >>   
> >>
> >> Participating hosts (12 -> 11)
> >> ------------------------------
> >>
> >>   Missing    (1): bat-bmg-3 
> >>
> >> Possible new issues
> >> -------------------
> >>
> >>   Here are the unknown changes that may have been introduced in xe-pw-161300v1_BAT:
> >>
> >> ### IGT changes ###
> >>
> >> #### Possible regressions ####
> >>
> >>   * igt@sriov_basic@enable-vfs-autoprobe-on:
> >>     - bat-bmg-2:          [PASS][1] -> [ABORT][2] +1 other test abort
> >>    [1]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-bmg-2/igt@sriov_basic@enable-vfs-autoprobe-on.html
> >>    [2]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-bmg-2/igt@sriov_basic@enable-vfs-autoprobe-on.html
> >>
> >>   * igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1:
> >>     - bat-bmg-1:          [PASS][3] -> [ABORT][4] +1 other test abort
> >>    [3]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-bmg-1/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
> >>    [4]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-bmg-1/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
> >>     - bat-atsm-2:         [PASS][5] -> [ABORT][6] +1 other test abort
> >>    [5]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5/bat-atsm-2/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
> >>    [6]: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/bat-atsm-2/igt@sriov_basic@enable-vfs-autoprobe-on@numvfs-1.html
> >>
> >>   
> >>
> >>
> >> Build changes
> >> -------------
> >>
> >>   * Linux: xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5 -> xe-pw-161300v1
> >>
> >>   IGT_8742: 8742
> >>   xe-4520-ab5b6da7d4879640bce3197597e0bc707bd60ab5: ab5b6da7d4879640bce3197597e0bc707bd60ab5
> >>   xe-pw-161300v1: 161300v1
> >>
> >> == Logs ==
> >>
> >> For more details see: https://intel-gfx-ci.01.org/tree/intel-xe/xe-pw-161300v1/index.html
> > 
> 

-- 
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation